T.J.
Registered User
Alaska
Interesting picture of a New Lycoming cylinder with 40 hrs since new. Compression was 10#. Notice the copper marks on the valve seat? That is the only area that the valve was touching the seat. I tried to lap the valve to the seat, didn't work. I sent it to Werner Reimer, he had to recut the seat and grind the valve. I wonder if this cylinder was built on Monday?